1999772028145 has 16 divisors (see below), whose sum is σ = 2441136240000. Its totient is φ = 1572227451648.

The previous prime is 1999772028109. The next prime is 1999772028157. The reversal of 1999772028145 is 5418202779991.

It is a cyclic number.

It is not a de Polignac number, because 1999772028145 - 2⁷ = 1999772028017 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42120 + ... + 2000329.

It is an arithmetic number, because the mean of its divisors is an integer number (152571015000).

Almost surely, 2^{1999772028145} is an apocalyptic number.

It is an amenable number.

1999772028145 is a deficient number, since it is larger than the sum of its proper divisors (441364211855).

1999772028145 is a wasteful number, since it uses less digits than its factorization.

1999772028145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045832.

The product of its (nonzero) digits is 22861440, while the sum is 64.

The spelling of 1999772028145 in words is "one trillion, nine hundred ninety-nine billion, seven hundred seventy-two million, twenty-eight thousand, one hundred forty-five".